有效抑制50Hz干扰的生物电放大器  

A Biopotential Amplifier with 50Hz Interference Suppression Effectively

作　　者：姬军[1] 俞梦孙[2] 

机构地区：[1]第四军医大学生物医学工程系,西安710032 [2]航空医学研究所,北京100036

出　　处：《北京生物医学工程》2006年第2期185-188,共4页Beijing Biomedical Engineering

摘　　要：目的介绍一种生物电放大器可以有效抑制50Hz交流电干扰对微弱电生理信号检测的影响。方法①提高整体电路共模输入阻抗以消除皮肤接触阻抗匹配失衡;②共模电压源控制恒流源降低仪表放大器等效共模输入阻抗;③右腿驱动电路减小共模电压。结果仿真实验和实际应用都表明该放大器在强烈50Hz交流电干扰和皮肤接触阻抗匹配严重失衡的条件下具有良好的干扰抑制能力和微弱信号放大能力。Objective A biopotential amplifier with elimination 50Hz interference effectively is proposed. Methods High eommon mode input impedance of the circuit is used to remove the interference due to imbalance electrode impedance. Current sources controlled by eommon mode voltage decreases equivalent common mode input impedance of instrument amplifier in the circuit and the driven-fight-leg circuit reduce common mode voltage. Results Simulation test and practical application demonstrated that the biopotential amplifier could amplify low signal and reject 50Hz interference very well in the intense interference and imhalanee electrode impedance.

关 键 词：50Hz交流电干扰 生物电放大器 共模抑制比 

分 类 号：R318.6[医药卫生—生物医学工程]